High-Index Lenses: Thinner and Lighter

July 29th, 2011 by Yaron Cheng Leave a reply »

People suffering nearsightedness with strong prescriptions often find themselves caught up in a dilemma where they have to compromise style just so they can have the lenses of rx eyeglasses that meet their corrective need. They can only choose from a limited number of frame types to see clearly and lenses that are extremely thick at the edge are required and these lenses aren’t compatible with today’s fashionable frames that are becoming more and more thin and light as a trend. Fortunately, the invention of high-index lenses may solve this problem for them.

High-Index Lenses

As we know, rx eyeglass lenses correct refractive errors by bending light as it passes through the lens. The amount of light-bending ability (lens power) that’s needed to provide good vision is indicated on the eyeglass prescription given by your eye doctor. The bigger the prescription, the larger of a curve is needed to achieve the light-bending effect required, hence the more material it takes to make the lens and the thicker the edges of the lenses will be. Regular lenses for high amounts of nearsightedness or farsightedness can be very thick and heavy, making them not only a pain in the neck to wear but also incompatible with various types of frame styles. New “high-index” plastic lens materials however can bend light more efficiently, which means by using less material than their conventional counterparts, lenses made of this material can achieve just as much light bending effect. Thanks to this new technology, people with strong prescriptions don’t need to limit their choice of frames any more.
High-Index Lenses

To achieve the best vision and appearance, you’d better have your high-index lenses coated up with an anti-reflective lens coating, AKA AR coating. Lenses with this type of coating allows up to 99.5 percent of light reach your eyes so that you can have the optimum vision. Besides that, AR coating can eliminate reflections of light from the lens itself both internally and externally, making the lenses appear nearly invisible, so next time when others are looking at your eyes, the eyes won’t be flashed by the reflection from your lenses. You will see the rest of the world with a more clear and accurate vision and since the light goes both ways, the rest of the world will see a more fresh and confidant you.


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